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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
This is one of the basic Python golfing trick, you can find it on Internet quite easily.
No, this is not correct. You can squeeze out 4 characters more.
map() in python 2.x used to return a list, py3 it was changed so list(map(...)) must be used, see the solution replies for a better understanding
edit: basically it was solved in a previous py version